Decinormal solution of NaCldeveloped an osmotic pressure of 4.6 atm at 300 K. Calculate its degree of dissociation.

Calculated Osmotic pressure of a decinormal solution =CRT   = 0.1 × 0.0821 × 300 = 2.46 atmObserved Osmotic pressure  = 4.6 atmi = observed colligative propertyNormal colligative property = 4.62.46 = 1.87Degree of dissociation (α) = i -1α -1                    =1.87 -12 -1 = 0.87% of dissociation = 100 × 0.87 = 87 %

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